Here is the full list of all 40 Archvale achievements.
Collect every badge.
Complete every trial.
Assemble the Arch Lexicon.
Collect all Heart Containers.
Defeat the Queen Duneworm.
Defeat the Soul Serpent.
Craft 30 items.
Obtain the best potion recipe.
Store over 10,000 gold in the bank.
Equip a shark cap and mermaid tail.
Cash in 10 treasures.
Defeat the Old King.
Reconstruct the gateway to Archvale.
Obtain Avarn's Sword.
Collect all healing flasks.
Defeat the Banished Executioner.
Defeat the Exiled Wizard.
Defeat the Colossal Skullbot.
Survive the ritual of the Molten Rift.
Defeat the Sunken Queen.
Complete half of your badge collection.
Defeat the Rotted King.
Defeat Frankenslime.
Defeat the Grove's Blight.
Destroy the barrier guarding Tanglegrove.
Own 8 hearts.
Defeat the Fallen Pharaoh.
Fully upgrade a weapon.
Defeat 1000 enemies.
Enter the Twisted Caverns.
Restore 10 fountains.
Defeat the Ghost Crab.
Defeat Mongo.
Defeat Maxilla.
Die.
Obtain an improved healing recipe.
Defeat the Great Slime.
Perform five consecutive dashes without stamina recharging.
Complete your first trial.
Find the village of Timberwell.